Cross-feed stop for lathes



Sept., 25 1923.

C. S. POOL Ross FEED sToP FOR LATHES Filed 001'.. lr, 1920 IN1/Emme. C pool,

` ATTORNEY.

Patented Sept. 25, ifhaa raie CHARLES S. POOL, OFTAFT, CALIFORNIA.

cross-FEED sror ron LArHns.

Application ed October l, 1920. Serial No. 414,102,

T o all whom t may concern:

VBe. it known that I, CHARLES S. POOL, a citizen of the United States, residing at Taft, in the county of Kern and State of California, have invented certain new and useful improvements in Cross-Feed Stops for Lathes; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same. p

This invention relates to a cross feed stop particularly for engine lathes designed primarily to afford a positive stop for the manually operable feed screw for the tool as when using a tapering attachment, and a plurality of pieces of work are to be turned or bored to the same extent or size.

Another object is to provide an adjustable collar or barrel in combination with the feed screw and a movable stopviitting into a spiral groove, one in the collar and`one in .the

screw. Y

Additional objects will appear hereinafter from the description following taken in connection with drawings of one practical embodiment.

Tn the accompanying drawing Figure l is a sectional view of one form of the cross feed screw stop mechanism,

Figure 2 is a perspective view of a cross key used in the stop mechanism,

Figure 3 is a sectional view of a modified form of the cross feed screw stop mechanism,

Figure 4 is view principally in transverse section through the attachment and parts of a lathe to illustrate its use.

In the form of the invention as illustrated in Figure l of the drawing. fthe same consists of a bearing l provided at one end with a Isocket. 2. The bearing f1 is further. provided with a bore 3 in whichthe cross feed screw 4 is mounted for sliding and turning movement. Thehearing l is mounted upon the carriage et the lathe (not shown) in a usual manner. The screw shaft 4 is provided at its side with a longitudinally disposed groove 5. A collar 6 is positioned at the end of the bearing 1 and is provided with a bar'-V rel portion 7 which enters the Vsocket 2 and is capable of axial turning movement therein. A headless setvscrew 8 passes through the bearing 2 and is engageable with the side of the barrel portion 7 to fasten the collar 6 in fixed relation to the hearing l.

upon the Y the collar or barrel 6 in fixed rela-tion to the 'bearing 1.1 The; feed screw/i can then be The barrel portion 7 is provided at its inner side with a helical groove 9,they said groove being square in transverse section andl having squared or rounded end walls.

A cross lkey comprising a base arm or block portion 10 ts snugly in the groove 5 of the screw 4 and which may'slide therein. Said cross key further includes a block portion or arm 1l which lies in the groove 9 and which may slide therein. The arms 10 and 11 of the key are disposed .in cruciform relation with respect to each other.

As an example of theactual Yuse of the stop mechanisnn reference should be had to Figure 4. Tnrthat figure, it will be noted that the bearing 1 is rigid or integral withk a slide or carriage A mounted for longitudinal movement on guides 'B of alathe bed C. The manipulating handle for operating the cross feed screw 4 is shown at D and the threads of said screw coact with a nut Edepending from a toolpost crossr slide yF resting on the slide A. G designates a guide bar adapted to be disposedl at any lsuitable angle according tothe taper desired and longitudinally of which a head H slidesr and with which the feed screw 4 is adapted to be adjustably,connected as at Thus with the stock properly centered parallel with the guides of the lathe, operation of the feed screw 4 will cause the tool post F and toolV l carried thereby to travel in a path parallel to that ofthe guide bar G, as the tool at the slide F' is automatically advanced lengthwise of the machine. Thus the extent of rotation of the feed screw 4 and accordingly the sliding movement of the tool post cross slide F is limited bythe coaction of the key with the groove 9. 1. Y

The invention isv particularlyV usefulin connection with al tapering Y attachment. Screw`4 is manually operable to feed the 'tool in relation tothe work. `After the work has been turnedor bored to the desired exn' turned axiallyV in `order that the key will abut the inner end of the groove 9. Therescrew 8 is tigh-tenedto maintain manually withdrawn or 'retracted in the usual manner. Subsequent feeding of the screw will permit it to move towards the Pwork until the key engages the inner endsof groove 9. It will thus be seen that the at- IS @if advantage when a number of pieces of work are to be turned or bored to the sai e extent or size, because after the first piece of work is finished, the attachment can be set or adjusted in order` that the feed screw will move only to the extent necessary to operate on subsequent pieces of work to the same extent or degree, The key .is always carried by and movable th the screw 4i inview of thedisposition oii'fariii 10 ingroove 5, and is also movable in theY groove 9. Y

in the forni ofthe nvention as illustrated in Figure 3 of the drawing, the same includes the featuresand elements liereinbefore described with the addition that the barrel Tof the collar is provided with an annular groove l2 which'may receive the inner end of a dowel screw 13 which passes through the side of the bearing l whereby the barrel? may rotate in the bearing` l when the set screw S is loosened, The cross key may be positioned at any desired point between the ends of the collar by looseningthe set screw 8 and turning the collar so that tliefportion 11 of the cross key moves along the groove 9 andwhen the cross key is at a desired position with relation tof'the Vcollar the set screw S is tightened and the parts are adjusted so the tool may be moved to a prescribed extent and with relation to the work that it is'operating` upon. The collar 6 is in practice .provided at its periphery and adjacent theend ofthe bearing l with a series ofglraduations which may be moved' across a mark or point upon the bearing l to indicate to they operator the .extent of movement imparted to the cross key when Lessines an arm slidably disposed in the helical,

grom'e of the barrel nee ber, and said arms being disposed substantially in cruc'form relation with respect to each other.

2. A; feed stop mechanism comprising a earingr7 a feed member mounted in the *bear* bj, a barrel member axially movable in the bearing and provided with a helicalV groove, and. a key carried by the feed member d'sposed in the groovelof the barrel member.

3. A feed stop mechanism comprising a feed member provided with a groovej a barrel member axially7 adjustable relativeiy to the feed member and'having grooves. key engaging' both of the groovesn one of said greoifesbeing helical, is

In testimony whereof l afiix my presence of two witnesses;

errantes s', rooL.

signature Vitnesses Colm Boss, Bumm CoDY, 

